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Spectral Evolutions Study of Gamma-Ray Burst Exponential Decays with Suzaku-WAM

Published online by Cambridge University Press:  05 September 2012

Makoto S. Tashiro ,
Kaori Onda ,
Kazutaka Yamaoka ,
Masahiro Ohno ,
Satoshi Sugita ,
Takeshi Uehara  and
Hiromi Seta
Makoto S. Tashiro
Affiliation:
Department of Physics, Saitama University, Sakura, Saitama, Japan, email: tashiro@phy.saitama-u.ac.jp
Kaori Onda
Affiliation:
Department of Physics, Saitama University, Sakura, Saitama, Japan, email: tashiro@phy.saitama-u.ac.jp
Kazutaka Yamaoka
Affiliation:
Research Institute for Science and Engineering, Waseda University, Shinjuku, Tokyo, Japan
Masahiro Ohno
Affiliation:
JAXA/Institute of Space and Astronautical Science, Sagamihara, Japan
Satoshi Sugita
Affiliation:
EcoTopia Science Institute, Nagoya University, Chikusa-ku, Nagoya, Japan
Takeshi Uehara
Affiliation:
Department of Physics, Hiroshima University, Kagami-Yama, Higashi-Hiroshima, Japan
Hiromi Seta
Affiliation:
Research Center for Measurement in Advanced Science, Rikkyo University, Tokyo, Japan
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Abstract

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An observational study is presented of the spectral evolution of gamma-ray burst (GRB) prompt emissions with the Suzaku Wide-band All-sky Monitor (WAM). We selected 6 bright GRBs exhibiting 7 well-separated fast-rise-exponential-decay (FRED) shaped light curves to investigate spectral changes by evaluating exponential decay time constants of the energy-resolved light curves. In addition, we carried out time-resolved spectroscopy of two of them which were located with accuracy sufficient to evaluate the time-resolved spectra with precise energy response matrices. The two imply different emission mechanisms; the one is well reproduced with a cooling blackbody radiation model with a power-law component, while the other prefers non-thermal emission model with a decaying turn over energy.

Keywords

gamma rays: burstsradiation mechanisms: nonthermalthermal
Type
Poster Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S279: Death of Massive Stars: Supernovae and Gamma-Ray Bursts , April 2011 , pp. 411 - 412
Copyright
Copyright © International Astronomical Union 2012

References

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